It is the dried ripe seed of Prunus armeniaca L.var.ansu Maxim.,Prunus sibirica L.Prunus mandshurica(Maxim.)Koehne or Pruns armeniaca L.,family Rosaceae.The seeds are collected from the ripe fruit in summer after the pulp is removed,and then dried in the sunshine.The raw or stir-baked are smashed into pieces to be utilized as medicine.